搜索结果: 1-15 共查到“知识库 理学 H2”相关记录95条 . 查询时间(0.12 秒)
CO luminosity functions for far-infrared- and B-band-selected galaxies and the first estimate for Omega(H I+H2)
surveys molecules
2014/12/24
We derive a nonparametric CO luminosity function using an FIR- and an optical B-band-selected sample of the galaxies included in the FCRAO Extragalactic CO Survey. The FIR-selected sample is defined u...
EQUIVARIANT SCHRODINGER MAPS IN TWO SPATIAL ¨ DIMENSIONS: THE H2 TARGET
EQUIVARIANT SCHRODINGER MAPS TWO SPATIAL DIMENSIONS THE H2 TARGET
2014/4/3
We consider equivariant solutions for the Schr¨odinger map problem from R2+1to H2 with finite energy and show that they are global in time and scatter.
研究线性Markov 切换系统的随机Nash 微分博弈问题. 首先借助线性Markov 切换系统随机最优控制的相关结果, 得到了有限时域和无线时域Nash 均衡解的存在条件等价于其相应微分(代数) Riccati 方程存在解, 并给出了最优解的显式形式; 然后应用相应的微分博弈结果分析线性Markov 切换系统的混合H2/H∞ 控制问题; 最后通过数值算例验证了所提出方法的可行性.
H2载气流量对AlN缓冲层生长的影响
氮化镓 AlN缓冲层 H2载气 Si衬底 金属有机化学气相沉积
2013/9/29
在Si(111)衬底上用金属有机化学气相沉积(MOCVD)设备生长了AlN和GaN薄膜。采用高分辨X射线衍射、椭圆偏振光谱仪和原子力显微镜研究了AlN缓冲层生长时的载气(H2)流量变化对GaN外延层的影响。椭圆偏振仪测试表明:相同生长时间内AlN的厚度随着H2流量的增加而增加,即H2流量增加会导致AlN生长速率的提高。原子力显微镜测试表明:随着H2流量的增加,AlN表面粗糙度也呈上升趋势。XRD测...
To Hash or Not to Hash Again?(In)Differentiability Results for H2 and HMAC
Indifferentiability Hash functions HMAC
2012/12/4
We show that the second iterate H2(M) = H(H(M)) of a random oracle H cannot achieve strong security in the sense of indifferentiability from a random oracle. We do so by proving that indifferentiabili...
在环缝-喷孔对撞式喷注模型发动机上，采用H2/O2热射流切向喷注的起爆方式，进行了H2/Air组合的连续旋转爆震试验，试验成功起爆并实现了爆震波的持续旋转传播。切向喷注的热射流并没有直接诱导形成旋转爆震波，从点火到形成稳定传播的旋转爆震波之间存在时间间隔。高频信号时频分析结果表明，在该试验工况下，旋转爆震波的传播过程非常稳定，其传播频率在5.35-5.85kHz之间，平均传播频率为5.61kHz，...
H2/Air连续旋转爆震的试验实现及传播过程的三维数值模拟
连续旋转爆震 H2/Air组合 试验研究 三维数值模拟
2013/3/15
在环缝-喷孔对撞式喷注模型发动机上，采用H2/O2热射流切向喷注的起爆方式，进行了H2/Air组合的连续旋转爆震试验，试验成功起爆并实现了爆震波的持续旋转传播。切向喷注的热射流并没有直接诱导形成旋转爆震波，从点火到形成稳定传播的旋转爆震波之间存在时间间隔。高频信号时频分析结果表明，在该试验工况下，旋转爆震波的传播过程非常稳定，其传播频率在5.35-5.85kHz之间，平均传播频率为5.61kHz，...
When sticking influences H2 formation
ISM: dust, extinction – ISM: molecules – ISM: abundances
2011/10/20
Aims. Interstellar dust grains, because of their catalytic properties, are crucial to the formation of H2, the most abundant molecule in the Universe. The formation of molecular hydrogen strongly depe...
A survey for near-infrared H2 emission in Herbig Ae/Be stars: emission from the outer disks of HD 97048 and HD 100546
circumstellar matter, stars – pre-main-sequence, emission-line, protoplanetary disks
2011/9/30
We report on a sensitive search for H2 1-0 S(1), 1-0 S(0) and 2-1 S(1) ro-vibrational emission at 2.12, 2.22 and 2.25 micron in a sample of 15 Herbig Ae/Be stars employing CRIRES, the ESO-VLT near-inf...
The deeply obscured AGN of NGC4945 I. Spitzer-IRS maps of [Ne V], [Ne II], H2 0-0 S(1), S(2), and other tracers
Galaxies:active – Galaxies:nuclei – Galaxies:individual:NGC 4945 – ISM:lines and bands
2011/9/27
The nearly edge-on galaxy NGC4945 is one of the closest galaxies where an AGN and starburst coexist, and is one of the brightest sources at 100 keV. Near and mid-infrared spectroscopy have shown very ...
Preparation of ZnO Nanoparticles and Photocatalytic H2 Production Activity from Different Sacrificial Reagent Solutions
Photocatalytic hydrogen production ZnO Photocatalytic activity Sacrificial reagent
2012/4/5
ZnO nanoparticles were synthesized via a direct precipitation method followed by a hetero-geneous azeotropic distillation and calcination processes, and then characterized by X-ray power diffraction, ...
参数不确定离散广义系统的H2/H∞优化控制
离散广义系统 不确定性 H2/H∞优化控制 线性矩阵不等式（LMI） 状态反馈
2012/11/12
利用线性矩阵不等式(LMI)研究一类不确定离散广义系统的鲁棒H2/H∞优化控制问题。对系统所有允许的不确定参数，提出了满足鲁棒H2/H∞混合性能的一个充分条件，以设计状态反馈控制律，保证闭环系统是允许的且满足鲁棒H2/H∞混合性能，得到了该问题可解的一个矩阵不等式的充分条件，并给出一个控制律的设计。
参数不确定离散广义系统的H2/H∞优化控制
离散广义系统 不确定性 H2/H∞优化控制 线性矩阵不等式（LMI） 状态反馈
2012/11/13
利用线性矩阵不等式(LMI)研究一类不确定离散广义系统的鲁棒H2/H∞优化控制问题. 对系统所有允许的不确定参数, 提出了满足鲁棒H2/H∞混合性能的一个充分条件, 以设计状态反馈控制律, 保证闭环系统是允许的且满足鲁棒H2/H∞混合性能, 得到了该问题可解的一个矩阵不等式的充分条件, 并给出一个控制律的设计.
An O(k2+kh2+h2) Accurate Two-level Implicit Cubic Spline Method for One Space Dimensional Quasi-linear Parabolic Equations
Quasi-Linear Parabolic Equation, Implicit Method, Cubic Spline Approximation, Diffusion-Convection Equation, Singular Equation, Burgers’ Equation, Reynolds Number
2013/1/30
In this piece of work, using three spatial grid points, we discuss a new two-level implicit cubic spline method of O(k2 + kh2 + h4) for the solution of quasi-linear parabolic equation , 0< x <1, t > 0...